JP2800927B2 - Laminate - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminate useful as a food packaging material or the like. More specifically, the present invention relates to a laminate having a silicon oxide vapor-deposited layer as a gas barrier layer against oxygen, water vapor, and the like, and having excellent lamination adhesive strength and transparency.

[0002]

2. Description of the Related Art As a transparent and flexible film having excellent gas barrier properties against oxygen and water vapor, a film obtained by laminating a silicon oxide vapor-deposited layer on a base film is known. A laminate obtained by further laminating a heat-sealable resin layer on such a laminate is a useful packaging material for packaging foods, medicines, chemicals and the like by heat sealing.

[0003] For example, Japanese Patent Publication No. 52-3418 discloses a method in which a silicon oxide vapor-deposited layer is formed on a base film, the silicon oxide vapor-deposited layer is anchored with an organic anchor agent, and then a polyethylene resin film is exposed. A technique of forming a laminated film by laminating by a lamination lamination method, or forming a silicon oxide vapor-deposited layer on a base film, laminating a polyethylene resin film by a dry lamination method via an adhesive to this silicon oxide vapor-deposited layer A technique for making a laminate film is described.

[0004]

However, when laminating a heat-sealable resin layer on a silicon oxide vapor-deposited layer, it is difficult to use a conventional general organic anchor treatment agent or an adhesive. There was a problem that sufficient laminate strength could not be imparted to the laminate.

When such a laminate is used as a packaging material, a printing layer is generally provided on the silicon oxide vapor-deposited layer in order to display the contents of the packaging or to improve the design of the packaging. It is formed, but when the printed layer is formed after the silicon oxide vapor deposited layer is anchored with a conventional organic anchoring agent, the turbidity of the solid portion of the film without the printed layer increases, and the transparency of the laminate decreases. I do. For this reason, there is also a problem that the original color of the contents cannot be seen after packaging.

Therefore, in order to laminate a heat-sealable resin layer on the silicon oxide vapor-deposited layer with a sufficient adhesive strength and to maintain high transparency of such a laminate, a special silane coupling agent containing a silane coupling agent is required. The heat-sealable resin layer had to be bonded by a dry lamination method using an adhesive (for example, AD980 manufactured by Toyo Ink Mfg. Co., Ltd.).

However, such a special adhesive is expensive, and there is a problem that the manufacturing cost of the laminate is increased. Therefore, a two-liquid counterpart known as a general adhesive
Attempts to use non-solder adhesives, which do not require an organic solvent in the manufacturing process and are cost effective, among the reactive adhesives
However, the adhesive strength of non-sol based adhesives was insufficient.
There is a problem that that.

The present invention is intended to solve the above-mentioned problems of the prior art. In a laminate having a silicon oxide deposition layer and a heat-sealing resin layer on a base film, the heat-sealing resin The purpose of the present invention is to provide a sufficient lamination adhesive strength even when the layers are bonded by using a generally used inexpensive non- sol based adhesive, and to maintain a high transparency of the laminate. .

[0009]

Means for Solving the Problems In laminating a heat-sealable resin layer using an adhesive, the present inventors
If the silicon oxide deposited layer is previously treated with an aqueous anchoring agent to form an aqueous anchoring layer, a non-sol based adhesive can be used as an adhesive.
Even if adhesive is used, sufficient lamination adhesive strength is not obtained.
In addition, they have found that the transparency of the laminate can be kept high , and have completed the present invention.

That is, the present invention provides a laminate in which a base material, a silicon oxide vapor-deposited layer, an adhesive layer and a heat-sealable resin layer are laminated in this order, wherein an aqueous anchor layer is formed on the silicon oxide vapor-deposited layer. And the adhesive layer is
Provided is a laminate characterized by being formed from a non-sol-based adhesive .

Hereinafter, the present invention will be described in detail with reference to the drawings.

FIGS. 1 and 2 are cross-sectional views of preferred embodiments of the laminate of the present invention. Laminate 10 of FIG.
Is a substrate 1, a silicon oxide deposited layer 2, an aqueous anchor layer 3,
The adhesive layer 5 and the heat-sealable resin layer 6 are sequentially laminated. In the laminate 11 of FIG. 2, the print layer 4 is formed between the aqueous anchor layer 3 and the adhesive layer 5. Others have the same layer configuration as the laminate 10 of FIG. here
The adhesive layer 5 is formed from a non-sol-based adhesive.
You. Thus, the laminate of the present invention is a laminate in which the heat-sealable resin layer 6 is laminated via the adhesive layer 5 on the silicon oxide vapor-deposited layer 2 formed on the base material 1. As long as the aqueous anchor layer 3 is formed on the silicon oxide vapor deposition layer 2 and the adhesive layer 5 is formed from a non-sol type adhesive, various layer configurations can be adopted . The adhesive layer 5 for adhering the heat-sealable resin layer 6 may be directly formed on the aqueous anchor layer 3 as shown in FIG. The printing layer 4 may be formed between them.

Here, the substrate 1 is made of polyethylene,
A flexible resin film such as polypropylene, polyester, or nylon, preferably a polyethylene terephthalate film can be used. The thickness of the substrate 1 is not particularly limited and can be appropriately selected according to the purpose of use.

The silicon oxide vapor-deposited layer 2 is provided on the substrate 1 for imparting gas barrier properties, in particular, oxygen barrier properties and water vapor barrier properties to the laminate. The composition of the silicon oxide deposited layer 2 is represented by a general formula SixOy (x = 1, 2, y = 0, 1, 2,
It can be a mixture of silicon compounds represented by 3). The thickness of the silicon oxide vapor-deposited layer 2 varies depending on the required color, flexibility, and the like.
00 angstroms. If the thickness is too large, cracks occur, which is not preferable.

The formation of the silicon oxide deposited layer 2 can be performed by a conventional method, for example, a vacuum deposition method, an ion plating method, a sputtering method, a plasma deposition method or a CVD method. From the viewpoint of cost merit, it is preferable to form by a vacuum evaporation method.

The aqueous anchor layer 3 is composed of the silicon oxide vapor-deposited layer 2
To enhance the adhesiveness between the adhesive layer 5 and the adhesive layer 5 or the printing layer 4. Such an aqueous anchor layer 3 is
It can be formed from an anchor agent dispersed in water, alcohol, or a mixture thereof, for example, aqueous polyethyleneimine (P-1000 or the like manufactured by Nippon Shokubai Chemical Co., Ltd.), aqueous butadiene (EL451 manufactured by Toyo Ink Manufacturing Co., Ltd.)
Aqueous urethane (T-185 manufactured by Nippon Soda Co., Ltd.)
Water-based acrylic (VM-1 manufactured by Toyo Ink Mfg. Co., Ltd.)
28 etc.) can be suitably used. Further, the thickness is preferably set to 0.2 to 2.0 μm.

The adhesive layer 5 is formed for bonding the heat-sealable resin layer 6. The adhesive layer 5, Roh
It is formed from an insol-based adhesive. As a non-sol adhesive
Requires no organic solvent in various general manufacturing processes and costs
For example, ADN-313A / B and ADN-3 manufactured by Toyo Morton Co., Ltd. can be used.
47, ADN-401A / B, ADN-403, and the like.

The heat-sealable resin layer 6 is a layer having heat-sealing properties when the laminate of the present invention is used as a packaging material to be heat-sealed. Such a heat-sealable resin layer 6 is made of a material conventionally used as a heat-sealable resin, for example, polyethylene,
It can be formed from polypropylene, ethylene-vinyl acetate copolymer, ionomer and the like. In addition, the thickness is not particularly limited, and can be appropriately determined as needed.

The printing layer 4 is formed on the aqueous anchor layer 3 as required, as shown in FIG. Generally, when the laminated body 11 is used as a packaging material, the laminated body 11 is provided to give a predetermined display or a desired design to be displayed on the package. The printing ink for forming the printing layer 4 is not particularly limited. In addition to an expensive urethane-based material having excellent adhesion, it can be formed from a commonly used inexpensive printing ink. For example, nitrocellulose resin mixed with polyamide as ink binder (GNCST manufactured by Toyo Ink Mfg. Co., Ltd., Dainippon Ink and Chemicals CAMZ, etc.), alkyd resin mixed with nitrocellulose resin (COS manufactured by Toyo Ink Mfg. Co., Ltd.)
T, Dainippon Ink and Chemicals, Inc. CLS, etc.) can be suitably used.

[0020]

[Action] In the laminate of this invention, upon laminating the heat-sealing resin layer via an adhesive layer to the silicon oxide deposited layer, so the aqueous anchor layer is formed in advance on the silicon oxide deposited layer, the adhesive Layer formed from non-sol based adhesive
Even so , the adhesive strength of the laminate becomes sufficiently high. In addition, the transparency of the solid portion of the laminate without the printing layer is kept high.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to embodiments.

Example 1 A 400 .ANG.-thick silicon oxide vapor-deposited layer was formed on one side of a polyester film having a thickness of 12 .mu.m by a vacuum vapor deposition method. Chemical Co., Ltd. P-1000) was applied using a gravure plate having a plate depth of 26 μm at an application amount of 1.2 g / m ² (0.2 to 0.5 μm),
Dry to form an aqueous anchor layer. Next, the printing layer was formed by partially solid-printing the aqueous anchor layer using a usual gravure printing ink (GNCST manufactured by Toyo Ink Mfg. Co., Ltd.). Then, a non-sol based adhesive (ADN-347 manufactured by Toyo Morton Co., Ltd.) was applied on the printed layer using a non-sol laminator at an application amount of 1.2 g / m ² (about 1 μm).
m) and applied to an unstretched polypropylene film (thickness 2).
5 μm) to form a laminated film.

The solid printed portion of the laminated film is 15 mm
When cut into widths and the adhesive strength between the polyester film and the polypropylene film was measured, the film was peeled between the silicon oxide deposited layer and the printed layer, and the strength at that time was 230.
２４０240 g / 15 mm width. Similarly, the adhesive strength of the uncoated portion of the laminated film was measured.
g / 15 mm width. Moreover, when the turbidity of the plain part was measured, it was HAZE degree 6.30.

Example 2 Example 1 except that no printed layer was formed on the aqueous anchor layer
A laminated film was prepared in the same manner as described above, and the adhesive strength and turbidity were measured. As a result, the adhesive strength was 230 to 260 g / 1.
The width was 5 mm, and the turbidity was 6.30.

Comparative Example 1 A laminated film was prepared in the same manner as in Example 1 except that no aqueous anchor layer was formed on the surface of the silicon oxide vapor-deposited layer, and its adhesive strength and turbidity were measured. As a result, this laminated film was also peeled between the silicon oxide deposited layer and the printing layer,
The strength at that time was only 180 g / 15 mm width in the printing part and 30 to 40 g / 15 mm width in the plain part, and the turbidity of the plain part was HAZE degree 6.30.

Comparative Example 2 Instead of the aqueous anchoring agent, a urethane organic anchoring agent (trade name: LP Super 30 manufactured by Toyo Ink Mfg. Co., Ltd.)
A laminated film was prepared in the same manner as in Example 1 except that 1) was used, and its adhesive strength and turbidity were measured. As a result, the adhesive strength of this laminated film was 180 g /
The width was 15 mm, and the plain part had a width of 170 g / 15 mm. The turbidity of the uncoated portion was 6.88.

[0027]

According to the present invention, an inexpensive non- sol adhesive which is generally used in a laminate having a silicon oxide vapor deposited layer and a heat-sealing resin layer on a base film. In this case, it is possible to obtain a sufficient laminating adhesive strength even when bonding is performed by using, and it is possible to maintain high transparency of the laminate.

[Brief description of the drawings]

FIG. 1 is a sectional view of a laminate of the present invention.

FIG. 2 is a cross-sectional view of another embodiment of the laminate of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base material 2 Silicon oxide vapor deposition layer 3 Aqueous anchor layer 4 Printing layer 5 Adhesive layer 6 Heat sealing resin layer 10 Laminated body 11 Laminated body

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yuji Komiya 1-5-1, Taito, Taito-ku, Tokyo Toppan Printing Co., Ltd. (56) References Japanese Utility Model No. 5-44526 (JP, U) Shoko Shoji 52 -3418 (JP, Y2) (58) Fields investigated (Int. Cl. ⁶ , DB name) B32B 1/00-35/00

Claims (1)

(57) [Claims] 1. A laminate in which a substrate, a silicon oxide deposited layer, an adhesive layer and a heat sealable resin layer are laminated in this order, wherein an aqueous anchor layer is formed on the silicon oxide deposited layer, And the adhesive layer is a non-sol adhesive.
The laminated body characterized by being formed from .